[Axis2] Exception occurred while trying to invoke service method

[Kay*]

Hello,
first of all, I apologize for my bad English...
I have a problem but I don't know  how I can resolve it.
This is code:

------------------
PrintOnVideo.java
------------------
package stampa.wservice;
import stampa.data.Ordinabile;

public class PrintOnVideo{

  public String print(Ordinabile o){
     System.out.println("E' stato ricevuto un oggetti di classe
"+o.getClass().getName());
     return (o.getClass().getName());
   }
}

------------------
Ordinabile.java
------------------
package stampa.data;
public interface Ordinabile
{
  public boolean maggioreDi(Ordinabile o);
}

-------------------
PrintClient.java
-------------------
package stampa.client;

import javax.xml.namespace.QName;

import org.apache.axis2.AxisFault;
import org.apache.axis2.addressing.EndpointReference;
import org.apache.axis2.client.Options;
import org.apache.axis2.rpc.client.RPCServiceClient;

import stampa.data.Carte;


public class PrintClient {

   public static void main(String[] args1) throws AxisFault {

       RPCServiceClient serviceClient = new RPCServiceClient();

       Options options = serviceClient.getOptions();

       EndpointReference targetEPR = new EndpointReference("
http://localhost:8080/axis2/services/PrintOnVideo";);

       options.setTo(targetEPR);

       // Setting the weather
       QName opPrint = new QName("http://wservice.stampa/xsd";, "print");

   //setto l'oggetto
   Carte obj = new Carte("Re","Nero","Fiori");

       Object[] opPrintArgs = new Object[] { obj };
       Class[] returnTypes = new Class[] { String.class };

       Object[] risposta = serviceClient.invokeBlocking(opPrint,
opPrintArgs,returnTypes);
   String cclasse = (String) risposta[0];

       if (cclasse == null) {
           System.out.println("Weather didn't initialize!");
           return;
       }

       // Displaying the result
       System.out.println("La risposta e' stata "+cclasse);
   }
}

-------------
Carte.java
-------------
package stampa.data;

public class Carte implements Ordinabile{

 private String valore, colore, seme;

  public Carte(){
     valore=new String("Asso");
     colore=new String("Rosso");
     seme=new String("Cuori");
  }
  public Carte(String val, String col, String sm){
     this.valore=val;
     this.colore=col;
     this.seme=sm;
  }

  public boolean maggioreDi(Ordinabile o){
     if (o instanceof Carte){
    Carte p=(Carte)o;
    boolean ok= seme.equals(p.getSeme());
        if ( ok ){
       int x= Integer.parseInt(valore);
       int ox= Integer.parseInt(p.getValore());
       return ( x>ox  );
    }else{return false;}
     }else{return false;}
  }

  String getValore(){return valore;}
  String getColore(){return colore;}
  String getSeme(){return seme;}
}


When I run my client, I have this exception:

linux:~/TESI/PrintOnVideo/build/PrintOnVideo # java -
Djava.ext.dirs=/usr/local/axis2-1.1.1/lib/ stampa.client.PrintClient
Exception in thread "main" org.apache.axis2.AxisFault: Exception occurred
while trying to invoke service method print
       at org.apache.axis2.description.OutInAxisOperationClient.send(
OutInAxisOperation.java:271)
       at org.apache.axis2.description.OutInAxisOperationClient.execute(
OutInAxisOperation.java:202)
       at org.apache.axis2.client.ServiceClient.sendReceive (
ServiceClient.java:579)
       at org.apache.axis2.client.ServiceClient.sendReceive(
ServiceClient.java:508)
       at org.apache.axis2.rpc.client.RPCServiceClient.invokeBlocking(
RPCServiceClient.java:95)
       at stampa.client.PrintClient.main(Unknown Source)


I don't know what it means....
How can I resolve my problem?
Thanks very much!!

Kay*